{"note":"bim_versions 導入後の保存のみ記録 (それ以前は bim_canonical 上書きで履歴なし)","ok":true,"slug":"u-churchstreetsunlitbu-rz1uxv0e","versions":[{"created_at":"2026-06-10T13:22:23Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積90.0㎡(基礎/屋外/ロフト除外)。設備数量/コスト過大の是正","saved_by":"mcp","sha256":"11b37111c90abd23fb06d970d615cfafa5d509eb8e2629a0e63926d557469cb0","version":10},{"created_at":"2026-06-10T10:22:59Z","element_count":91,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"cec33e8d1186c1f41d801aa4f6242f4b0f384eb9d2bde26471acfac8978052ad","version":2}]}